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Transport In Plants

Question

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On what properties of water does the ascent of xylem sap depend?

Solution

The ascent of xylem sap depends on the following properties of water :

i. Cohesion – It is themutual attraction between water molecules.
ii. Adhesion – It is the attraction of water molecules to polar surfaces (such as the surface of tracheary elements).
iii. Surface Tension – The water molecules are attracted to each other in the liquid phase more than to water in the gas phase.

Some More Questions From Transport in Plants Chapter

Why the water is forced to move through cell membrane beyond endodermis ?

Why the cortex produces no resistance to movement of water ?

What is transmembrane pathway ?

Give the term for the ability to resist a pulling force.

Who introduced the apoplast—symplast concept ?

Why transpiration is more on lower surface than on upper surface of leaves ?

Give the term for the ability to rise in thin tubes.

What is capillarity ?

Name the two forces responsible for the rise of water in a capillary tube.

Which force is first operative in translocation of water through capillarity : cohesive force or adhesive force ?

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